When I push the menu button, it says it is locked. How do i unlock it?

Try this, press Vol- and Vol+ buttons at the same time to unlock osd menu and do the same to lock it.

holding down the select/menu button and pushing the power button and keep holding the select button down until the menu appears and hey presto, one unlocked osd!
Repeat the process to lock it again.

http://forum.ts.fujitsu.com/forum/viewtopic.php?f=100&t=30092
hope this helps

OSD LOCKED/UNLOCKED
This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear. system admin

Push the MENU button for 10`15 seocnds to lock/unlock the control buttons.
http://www.fixya.com/support/r4460477-hp_vs_15_17_19_f_1705_1905_lock

Hold the MENU button for ten seconds to unlock or lock the OSD.

This information is from your manual for the L194WT:
OSD LOCKED/UNLOCKED
This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear.


Please rate me if this solution works for you

Thanks......Have a great time

This feature is provided in order to avoid accidental key activation during recording or playback.

1. Press and hold MENU for three
seconds, LOCKED will flashes on display. (LOCK icon will be shown)
2. Press and hold MENU for three seconds again to unlock keys.

You may wish to try this (my model AOC g2016wa2)
1. push MENU button
2. scroll to Advanced
3. push MENU button
4. scroll to Factory recall
5. push MENU button
It resets the power button locked setting but you lose all other settings.

accoreding to the dell support website, it says to do this
FROM DELL:
NOTE: You can also lock or unlock the OSD by pushing and holding the Menu button for 15 seconds. In this mode All buttons will be locked including the "Menu" button. You can unlock by pushing and holding the Menu button for 15 seconds.

web link: http://support.dell.com/support/edocs/monitors/2005FPW/En/setup.htm

But this fix DID NOT WORK for me....maybe it will for YOU....good luck.

All buttons can be locked or unlocked when the 'Menu' button is pushed and held for over 15 seconds.

NOTE: You can also lock or unlock the OSD by pushing and holding the Menu button for 15 seconds. In this mode All buttons will be locked including the "Menu" button. You can unlock by pushing and holding the Menu button for 15 seconds.

Reference:

http://support.dell.com/support/edocs/monitors/2005FPW/En/setup.htm#Using%20the%20OSD